There's a pretty large community online 3D printing prosthetics, mainly the loosely affiliated community called enabling the future[0] and a nonprofit which spr

There's a pretty large community online 3D printing prosthetics, mainly the loosely affiliated community called enabling the future[0] and a nonprofit which sprung from them called Limbforge[1]. The printed prostheses are almost all body powered, which means they use some sort of harness to pull a cable with the closest extant joint on the arm, and those cables close the grip. As body powered prostheses go, they're pretty good nowadays. They're still nowhere near the usefulness of say a BeBionic, but they cost tens of dollars instead of tens of thousands, so it's a reasonable trade-off. Kids are the best use case by far though, because they grow out of their hands every year or two. When you can amortize the cost over years I think the high end devices are a much better choice, but if someone can't afford them or just doesn't want a prosthesis that badly the printed options are still a nice alternative. [0]: http://enablingthefuture.org/ http://enablingthefuture.org/ [1]: https://www.limbforge.org/ https://www.limbforge.org/